pcm

Hello, I just bought an extremely well-maintained 2006 LJR, and I was planning to move all the good parts from my current 2006 TJR to it (yes, the extra inches do matter when you have twins.. 😄), since I plan to sell the TJ. While going through the LJ, I noticed that the PCM has a...

I’m having an issue where every time I go to start my jeep tj it’s automatically in limp mode. Unless I drive it a few miles and turn it off and on again it goes back to normal. Im guessing it’s an electrical or tcm problem. What should I check to test out my pcm and tcm before I send either out...

TL;DR, I hate my 42RLE, I don't have the money for Novak bits (especially since I live 1 ocean and 2ish continents away) so I made my own Manual conversion using some CAD, a hole saw and a local sheet metal supplier. She's got about 1,400km on her since her surgery, going strong with a hint of...

Hello All. 2006 Wrangler, 4.0, Auto. Here’s the situation: After adding a can of Seafoam Trans Tune (I know many will roll their eyes, lol) I IMMEDIATELY started having a very hard shift from 1st to 2nd gear. And It is also slow to shift into 4th gear and overdrive. This improves...

Currently wrestling with a silly little TJ. (97) Had O2 sensor codes and rough idle with loss of power before engine reached “closed loop” temps. Replaced O2 sensors (with the ones recommended by the updated O2 sensor thread) and it ran fine. Drove about 1800 miles then bang O2 codes again...

Hi all, I’ve been having this misfiring engine for a while now. It sometimes doesn’t trigger a CEL and sometimes does. Seem to happen on start up or when turning and hitting gas. Also noticed it more, when running low on gas. It goes away when I pull over and restart the engine, sometimes...

2002 TJ 4.0 w/ Automatic Hi all! New to the forum. Just looking for some opinions before I start spending $$$. Sorry if this is long, but just trying to give the whole story. Here is my situation... While driving the TJ my battery hold down came loose. The batter slid to the side and the...

I'm new to the forum and haven't found my exact issue in previous posts, so here goes. I recently purchased a 2006 Jeep Wrangler X with the 4.0 and automatic transmission from auction and quickly learned it had transmission issues. It was lagging on takeoff like it was starting off in wrong...

Hello, I have a 2001 TJ 4.0. At the beginning of this year my jeep would not start so I took it to a local mechanic. They let me know that it was most likely the PCM. They had it for a week and still could not diagnose the official problem, but adding a ground wire to the PCM seemed to bypass...

Hey y'all! I have a 98 jeep TJ with a 4.0 motor and manual trans, I brought it to a mechanic to diagnose a idling issue and someway or another the PCM got shorted out by the 02 sensor while they were driving it (so they claim). Sure enough the PCM was bad and the jeep wouldn't start. I replaced...

Hopefully this story helps someone else. I started having some electrical problems with my 2005 Sport with a 6 speed. I started getting an intermittent no crank situation. Jumping the starter would crank it, but no spark. I also noticed that my OPDA was a little loose, and it caused a crank/cam...

For the past forever ive been having issues with my wrangler from it saying I dont have a fuse, the oil pressure gauge going up and down, to the wrangler starting up very quickly one day to nothing but cranking a few days later. I took it to a fella who ran the codes for me and he says the brain...

Good morning everyone! First time poster here. Loving this resource so far. Greatly appreciate the service manuals. I have a No Crank condition. So far, I have; Ignition Cylinder (Replaced), Ignition Switch (Replaced), Neutral Safety Switch (Bench Test - good), Starter Relay (Bench Test -...

Searched the threads and I didn’t see this question asked. I’ve had the TJ for 3 years and a prior owner had removed the SKIM sensor. No problems starting and running in 3 years until recently when the engine would stall after a couple of seconds running and I got the P1686 code. I sent the PCM...

Hey Y'all I have a 2006 TJ 4.0 Auto that decided it wanted to shell the factory PCM. At first it was throwing a P0203 code and after replacing the wiring harness, it came down to there is no output from that pin out of the factory PCM. I ordered one off of WranglerFix from Mark and now the jeep...

Hello all, I am in need of assistance. Found some frame rot on my jeep and parked for a bit and was starting it every couple of weeks by the 2nd or 3rd time it just cranked and no start. I have my 5 volt reference to the crank sensor. My ASD relay and fuel pump clicks when keyed on. I tried...

Curious if anyone knows if I can put a 99 2.5 stand trans pcm into a 97 2.5 standard trans? And will it run correctly?

Got a little technical question. My 2002 tj 4.0 5 spd with 221000+ miles would occasionally stutter some but otherwise ran great. The check engine light was on and I got P1391. I swapped the cam sensor, no change. Swapped the crank sensor, let it idle 10 minutes and drove it across the yard...

HELP!! Looking for a PCM and or someone that can point me in the right direction. They are discontinued at the dealership, and lot for websites I look at are $1800 the website looks like a scam.

Hi all, The past few months I've been having troubles with my Jeep. I've looked around all over and made a post here trying to diagnose it and have come up with it maybe being the TCM. Have one ordered up and it arrives tomorrow! But today the problems got worse. I have driven the TJ 3 times...